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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 1
 8
 4
 2

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Electrical Machines
Hunting in a synchronous motor takes place

  when supply voltage fluctuates.
  when load varies.
  when power factor is unity.
  motor is under loaded.

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Electrical Machines
It is advisable to start a DC series motor with some load to

 Avoid sparking.
 Limit the current.
  Limit the speed.
 Limit the flux.

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 burn.
 not run.
 run at normal speed.
 run at lower speed.

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Over-excitation.
  Over-loading for long period.
  Small and constant load.
  Periodic variation of load.

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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will

 draw too much current.
 produce sparking at brushes.
 develop excessive speed and damage itself.
 open fuse or circuit breaker.

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